Calculator.



J. G. VINCENT.

CALCULATOR.

APPLICATION FILED FEB. 21. 1911.

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CALCULATOR.

APPLICATION FILED FEB. B. 1911.

J. G. VINCENT.

CALCULATOR.

APPLICATION FILED FEB. 8. 1911.

Patented Mar. (5, 1917.

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CALCULATOR.

APPLICATION FILED FEB. 8. I9II.

Patented Mar. 6, 1917.

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GHO'ZHCtAS .I. G. VINCENT.

CALCULATOR.

APPUCATION FILED FEB. 8. 1911. 1,218,136. Patented Mar. 6,1917.

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CALCULATOR.

APPLICATION FILED FEB. 8, 1911.

Patented Mar. 6, 1917.

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CALCULATOR. APPLICATION FILED FEB. 8, Ian.

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Patented M31. 6, 1917.

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J. G. VINCENT. CALCULATOR.

APPLICATION FILED FEB. 8. I911. 1,218,136.

J. G. VINCENT. CALCULATOR.

APPLICATION FILED FEB. 8,19II- 1,218,136.

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J. G. VINCENT. CALCULATOR.

APPLICATION FILED FEB. 8, 191l- 1,218,136.

Patented Mar. 6, 1917.

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APPLICATION FILED FEB. 8. 1911. 1,218,136. Patented Mar. 6, 1917.

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CALCULATOR.

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CALCULATOR.

APPLICATION FILED FEB. 8, 1911.

Patented Mar. 6, 1917.

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CALCULATOR.

APPLICATION FILED FEB. 8. I91!- Patented Mar. 6, 1917.

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A 1 Snow doc im 4? M UNITED STATES PATENT our-10E.

JESSE G. VINCENT, OF DETROIT, MICHIGAN, ASSIGNOR TO BURROUGHS ADDING MACHINE COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

CALCULATOR.

Application filed February a, 1911.

To all whom it may concern:

Be it known that I, J nssE G. VINCENT, a citizen of the United States, residing at Detroit, county of \Vayne, and State of Michigan, have invented certain new and useful Improvements in Calculators, of which the following is a specification.

The present invention relates primarily to digit will be a partial product. In the latter case the multiplicand will be again set up on the keyboard one decimal place to the left and with the next digit of the multiplier set up a single pull of the operating handle will add to the partial product another partial product and so on until the complete product is registered.

WVith the above object in view, the invention consists in certain novel features of construction and combinations of parts the essential elements whereof are recited in the appended claims and a preferred form of embodiment of which is described in detail hereinafter and fully illustrated in the accompanying drawings forming a part of this V specification. 1

Of said drawings, Figure 1 is a top plan view of the machine with the printing mechanism removed to show other parts more clearly; Fig. 2 is a vertical transverse section taken approximately through the center of the machine; Fig. 3 is a left-hand elevation of the machine with some parts removed for the sake of clearness; Fig. 3 is a top plan View of the left-hand end of the platen carriage showing the line spacing mechanism; Fig. 4: is a partial right side elevation; Fig. 5 is a continuation of Fig. 4; Fig. 6 is a vertical sectional view taken on line 66 of Fig. 4 and looking in the direction of arrow crossing said line; Fig. 7 is a front elevation of part of the front accumulator; Fig; 8 is a top plan view of Fig. 7; Fig. 9 is a section of the front accumu- Specification of Letters Patent.

Patented Mar. 6, 1917. Serial No. 607,282.

lato-r taken on line 9-9 of Fig. 8 looking in the direction of arrow crossing said line with parts at normal; Fig. 10 is a view similar to Fig. 9 but with the transfer tripped and the rack-bar traveling in the direction of the arrow thereon; Fig. 11 is a longitudinal vertical section of the rear accumulator and its transfer mechanisms taken on the line 1l-11 of Fig. 12; Fig. 12 is a rear View of Fig. 11; Fig. 13 is a detail View of the, transfer mechanism of the upper (units) racks in tripped position, the racks being shown moved forward from normal position; Fig. 14 is a top plan view of the transfer mechanism of the upper (units) racks innormal position as shown in Fig. 11; Fig. 15 is a detail View of the transfer mechanism of the lower (tens) racks in tripped position, the racks being shown moved forward from normal position; Fig.

16 is a top plan View (taken on the line' sition as shown in Fig. 11; Fig. 17 is a detail View of part of the multiplier bank and part of an amount bank, with a key depressed in each, also the stepped segment for the. depressed amount key in operated position controlling the positioning of the actuating racks; Fig. 18 is a left side elevation ,of the front portion of the machine, showing effect of depressing the total key; Fig. 19 is a View like Fig. 18, showing the subtotal key depressed; Fig. 20 is a view like Fig. 18, showingthe listing key depressed; Fig. 21 is a View like Fig. 18, showing the multiplication'key depressed; Fig. 22 is a view like Fig. 18, showing the product key depressed; Fig. 23 is a detail View of the graduated stop plate of the seven (amount) key; Fig. 24 is a sample of the work in single column formation, using the automatic line-spacing mechanism; Fig. 25 is a sample of the work in triple column formation with the automatic line-spacing mechanism thrown out.

General description.

The principal sections of the machine are as follows: The keyboard which controls the positioning of the graduated stop plates and the movements of the accumulators; the rear accumulator upon which the different operations of multiplication are accumulated; the frontaccumulator upon which addition tiplication.

is performed and to which the multiplica tion products are transferred from the rear accumulator; the printer section for printing amounts, multiplicands, multipliers, products, subtotals and totals and special characters distinguishing the imprints; and the driving mechanism.

In the present machine there are nine banks of amount keys and one bank of multiplier keys, said multiplier keys being the first bank at the right and having hexagon heads.- Each bank of amount keys is provided with nine graduated stop plates having their peripheries slotted according to the multiplication table. The depression of an amount key releases its own individual stop plate.

In addition to the nine stop plates, each bank is provided with an initial stop plate which is released when any key in its associated bank is depressed. This initial stop plate, in its normal position, blocks the tens (lower) rack and forms a stop for the units (upper) rack, thus limiting the movement of the type carrier so as to set the zero type for printing. The multiplier keys determine the distance the released graduated stop plates will be allowed to drop.

The following sequence of operations is followed in pjetiformingan example in mule. 5483 by 683, we first press the listing (L) key and set up 5483 (the multiplicand) on the first four banks of amount keys. The depression of the listing key serves'to prevent the item from being accumulated. The machine is now operated to list or print the multiplicand. The next step is to set up the multiplier on the amount keys and depress the listing key. The machine now being operated prints the multiplier just below the multiplicand thus:

To proceed we now press the multiplication (M) 'key which serves to block the printing hammers and to disable the automatic linespacing mechanism of the carriage. The multiplicand 5483 is then again setup on the first four banks of amount keys. This releases the stop plates in each bank corre-' sponding to the keys depressed. The first 9. we are to multiply the multiplicand is set up on the second, third, fourth and fifth banks. The second digit (8) of the multiplier is now set up on the multiplier bank and the machine operated. This product is accumulated on the rear accumulator as stated above in connection with the product of the first digit of the multiplier.

This operation is repeated for each digit in the multiplier.

As hereinbefore stated, the M key remains depressed until the P key is depressed. The P (or product) key it depressed after the above operation is repeated for each digit of the multiplier. The depression of said key serves to lock all of the amount keys and the multiplier keys against depression and to release the M (or multiplication) key, also. to so set the controlling mechanism of the accumulators that upon operation of the machine the product of multiplication as accumulated on the rear accumulator will be transferred to the front accumulator.

In plain addition the amounts are added directly on the front accumulator as will be hereinafter explained. Of course addition can also be done on the rear accumulators by using the one (1) multiplier key, in which case the operation will be precisely as in multiplicatlon.

Keyboard, (Figs. 1 2, 4, 6 and 17.)

Referring to Fig. 2, the keys Af slide through slots in the keyboard plate and through slots in a series of angle brackets below said keyboard plate. The keys are normally upheld by springs surrounding the stems between the brackets and suitable shoulders on the keys. Each key is provided at its lower end with a pin which engages in an oblique slot in a releasing bar A. Said bars are slotted at their rearward ends and are supported and guided by a cross-rod A which is mounted in an angle bracket running between the two keyboard frames A and supported thereby. The releasing bar A has at its rearward end a depending hooked projection A which engages with and upholds its corresponding stop plate A.

The releasing bars A have short forward extensions A at their forward ends and also have short rearward extensions A just back of the obliquely slotted portion. By this arrangement one cross rod ver, thereby also supporting said lever.

The releasing levers A are held from lateral displacement at their forward ends by engagement 1n slots in the vertical portions A serves to support two releasing levers of the angle brackets guiding the key stems,

each lever being guided by two of the angle brackets, the forward extension A engaging in the slot of the bracket immediately above it and the rearward extension A engaging in the slot of the next higher bracket.

It will be obvious that the depression of any amount key will cause rearward movement of its releasing lever A by reason of the cam action between the pin in the key stem and the oblique slot in said lever. This rearward movement of the releasing lever A of any amount key will remove the hooked projection A from engagement with its corresponding stop plate which will be lowered to a predetermined position when the machine is operated. Of course it is understood that there are nine of these raduatod stop plates A for each amount bank (see Fig. 6). These plates are-mounted loosely upon a cross-rod A which extends between the two keyboard frames A Said plates are spaced on the cross rod A by circular disks or washers A which also serve to hold from displacement the forward ends of springs A Said springs are bent around two cross rods and are separated thereon by small disks or washers. The forward ends of the springs rest on the upper edge of the plates A and tend to force said plates downward. Thetwo cross-rods supporting the said spring}? are supported at their lefthand ends in t e left-hand keyboard frame A and on their right-hands ends in a bracket A which is secured to the cross-rod A which is mounted rigidly in the keyboard frames A (see Fig. 4). This is done so as to avoid interference with mechanism of the multiplier bank.

The released stop plates A are upheld, until the machine is operated, by a restoring bail A which is operated by mechanism to be hereinafter described.

It is not only necessary that the depression of an amount key shall release its associated stop plate, but by the same act the initial stop plate A must of course be withdrawn from the path of the actuating racks.

These initial stop plates are similar in form to the amount stop plates and are more clearly shown in dotted lines in Fig. 17

The latching pawls A of the initial stop plates are pivoted on a cross-rod A and have pin-and-slot connections with looking detents A actuated by pins on the key stems coacting with oblique slots in said detents. As will be seen by referring to Fi 17, the depressionof a key in any bank wi 1 cause all of the remaining keys in said bank to be locked. 1

Fig. 17 shows the seven (7) key ofan amount bank depressed thereby releasing its graduated stop plate and also the initial stop plate of that bank.

Referring next to the multiplier bank,

Figs. 4 and 6, it will be noted thatthe key construction is similar to that of the amount keys, the pins in the lower ends of the keys A engaging in oblique slotsin a series of stop bars A which extend rearwardly and are guided on studs A secured to th keyboard frame A Said stop bars A are provided with laterally extending ears A which are adapted when the keys are depressed, to be moved into the path of a stud A secured to the top of a vertical link A and guided in its vertical reciprocation by a slot A cut into the keyboard frame A Said link is connected to an upturned end of the right side arm of the restoring bail A". A spring A normally exerts its tension to lower said bail.

From this construction it will be evident that the depression of a key in the multiplier bank will limit the downward movement of the restoring bail A and it is the restoring bail that controls the setting of the graduated stop plates A, the latter in turn controlling the setting of slidingrack bars B and B according to the product of the multiplicand (as set up on the amount keys) and multiplier (as set up on the multiplier bank).

Graduations ofistop plates, (Figs. 17 and'23.)

By reference to Fig. 23 (which illustrates the graduated stop plate of one of the 7 keys) the arrangement of the graduations will be clearly understood. This plate is out according to the multiplication table 4 of seven, the multiplier determining the number of spaces said plate is allowed to drop. Thus when nine is themultiplier, said plate will be permitted to drop two spaces; when eight is the multiplier four spaces, etc. The upper spaces, of these sets of two spaces each, are cut a suflicient number of spaces in a radial direction to determine the number of units in the product of seven multiplied by a certain multiplier. The lower space of each set of two spaces is out a sufiicient number of spaces in a radial direction to determine the number of tens in the product. Thus it will be plain that the circumferential graduations denote the multiplier and that the radial graduations denote the product.

In Fig. 17 the 7 amount key and the 4 multiplier key are shown in depressed position. The depression of the 7 amount key has released the 7 stop plate and the initial stop plate of its associated bank and has also locked from depression all other amount keys in the same bank. The depression of the 4: multiplier key has moved a stop projection A into the path of the stud A,

nations of the stop plate A*, it being noted that the units bar B has moved forward eight spaces and the tens bar B two spaces, making the product of seven multiplied by four, viz: twenty-eight.

Actuatin'g rack bars, (Figs. 1, 2, 3, 5 and 6.)

The actuating rack bars B and B are arranged in pairs, one pair for each bank. The bar B of each bank is situated at the right of the set of stop plates and provided at its forward end with a lateral projection or shelf 18 which extends toward the left (see Figs. 1 and 6) far enough to span its associated set of stop plates. These bars B extend rearwardly and over the rear accumulator and mesh therewith during their return stroke. I

The bar B of each bank is situated at the left of the set of stop plates in a lower plane than the bar B and provided at the forward end with a lateral projection or shelf B which extends toward the right far enough to span its associated set of stop plates. These bars B extend rearwardly and under the rear accumulator and each bar B meshes with the accumulator pinion of next higher denomination to that with which its companion rack B meshes, and during forward stroke to register'the tens of a product.

The units pinion of the rear accumulator has no tens rack bar (B but two alining teeth B are cut in a bracket secured to the base of the machine (see Fig. 5), and said pinion engages and is locked by said teeth when out of engagement with the units rack bar B. The rear accumulator is composed of ten accumulating pinions, the tenth pinion being necessary to accumulate the tens of products of the ninth bank. For the tenth pinion there is provided a rack bar B (see Figs. 1, 3 and 6) which is identical with the bars B excepting that it extends farther forward (this is to avoid interference between its lateral shelf B and the bracket B and its shelf is narrower. This rack bar is for the purpose of totalizing from said tenth accumulator pinion and co-acts with andis blocked by a special stop plate B which is similarto the initial stop plates A and is released by the depression of the total, sub-total or product keys as later described. All of the rack bars are mounted upon cross-rods B and B at the rear of the machine and upon cross rods B and B which are securedin brackets B and B and are held from lateral displacement by sleeves surrounding said'shafts.

The rack bars are spring drawn forward by springs B, (Fig. 2), which are interposed between said racksand a cross-plate B secured to the brackets B and B and are restored by a square restoring bar B Said restoring bar extends across the machine in the path of shoulders on the rack bars and is mounted between two reciprooted at B on each of the units rack bars B and the bar B of the tenth pinion of the rear accumulator are a series of downwardly and forwardly extending front accumulator actuating rack bars B which at'their forward ends surround a cross-rod B and are held from lateral displacement by sleeves surrounding said cross rod.

Front accumulator, (Figs. 1, 2, 4, 7, 8, 9 and 10.)

The front accumulator consists of ten number wheels D and their companion gear pinions D which are strung upon a shaft 11) carried by a pair of arms D journaled on a cross-rod D The pinions D are adapted to be operated upon by racks D which are connected by pin-and-slot connections to slide upon the bars B. This allows each rack a movement independent of its bar B sufficient to allow for the carry or transfer. A spring D secured at one end to the rack and at the other end to the bar B tends to slide the rack on said bar. Normally the rack is retained against such movement by the engagement of a stud D", (see Fig. 9) projecting from its right side, with the forward edge of an ear D of the transfer pawl D of next bank to the right. It will of course be understood that the units rack does not partake of the extra movement to effect a transfer, so its stud simply contacts with a fixed stop D (see Figs. 4, 7 and 8).

There is one of the awls D for each bank and each pawl is ormed with a beveled nose D to be acted upon by the usual transfer pin D on the next lower wheel D whereby the pawl will be moved by said pin to take the ear D out of the path of the stud D The rear edge of the nose D of said pawl constitutes a zero stop when the wheel is rotated reversely, as in the taking of totals or the clearing of the accumulator.

It will be understood that the tripping of a transfer pawl may take place when the rack with which that pawl is associated is itself out of normal and operating upon its own pinion. Consequently it is necessary to maintain the pawl in displaced position after the transfer pin has passed the beveled nose of the pawl. This is provided for by'latches D which are loosely mounted upon a fixed cross-rod D and connected by springs D to the transfer pawls D", the springs thus serving not only to impel the latches toward latching position but also to hold up the transfer pawls. The latches are 

